noosfero | Fix user email validation (#644)

[Bráulio Bhavamitra]

New comment for Merge Request 644

https://gitlab.com/noosfero/noosfero/merge_requests/644#note_1822955


Bráulio Bhavamitra

this broke several tests: https://travis-ci.org/noosfero/noosfero/builds/74132010

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